15971794660 has 24 divisors (see below), whose sum is σ = 34697348280. Its totient is φ = 6168417024.

The previous prime is 15971794613. The next prime is 15971794679. The reversal of 15971794660 is 6649717951.

It can be written as a sum of positive squares in 4 ways, for example, as 48888064 + 15922906596 = 6992^2 + 126186^2 .

It is a super-2 number, since 2×15971794660² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13768209 + ... + 13769368.

It is an arithmetic number, because the mean of its divisors is an integer number (1445722845).

Almost surely, 2^15971794660 is an apocalyptic number.

15971794660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15971794660 is an abundant number, since it is smaller than the sum of its proper divisors (18725553620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15971794660 is a wasteful number, since it uses less digits than its factorization.

15971794660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27537615 (or 27537613 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 15971794660 in words is "fifteen billion, nine hundred seventy-one million, seven hundred ninety-four thousand, six hundred sixty".